text: # Copyright 2013 Devsim LLC
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from devsim import *
  from devsim.python_packages.simple_physics import *
  import diode_common
  
  device="diode3d"
  region="Bulk"
  
  
  diode_common.Create3DGmshMesh(device, region)
  
  # this is is the devsim format
  write_devices (file="gmsh_diode3d_out.msh")
  
  diode_common.SetParameters(device=device, region=region)
  
  ####
  #### NetDoping
  ####
  node_model(device=device, region=region, name="Acceptors", equation="1.0e18*step(0.5e-5-z);")
  node_model(device=device, region=region, name="Donors",    equation="1.0e18*step(z-0.5e-5);")
  node_model(device=device, region=region, name="NetDoping", equation="Donors-Acceptors;")
  
  diode_common.InitialSolution(device, region)
  
  
  ####
  #### Initial DC solution
  ####
  solve(type="dc", absolute_error=1.0, relative_error=1e-12, maximum_iterations=30)
  
  ###
  ### Drift diffusion simulation at equilibrium
  ###
  diode_common.DriftDiffusionInitialSolution(device, region)
  
  solve(type="dc", absolute_error=1e10, relative_error=1e-8, maximum_iterations=50)
  
  v = 0.1
  while v < 0.51:
    set_parameter(device=device, name=GetContactBiasName("top"), value=v)
    solve(type="dc", absolute_error=1e10, relative_error=1e-8, maximum_iterations=30)
    PrintCurrents(device, "top")
    PrintCurrents(device, "bot")
    v += 0.1
  
  element_from_edge_model(edge_model="ElectricField",   device=device, region=region)
  element_from_edge_model(edge_model="ElectronCurrent", device=device, region=region)
  element_from_edge_model(edge_model="HoleCurrent",     device=device, region=region)
  
  write_devices(file="gmsh_diode3d_dd.dat", type="tecplot")
  write_devices(file="gmsh_diode3d_dd.msh", type="devsim")
  
  #element_from_node_model(node_model="node_index", device=device, region=region)
  #en0 = map(lambda x : int(x), get_element_model_values(name="node_index@en0", device=device, region=region))
  #en1 = map(lambda x : int(x), get_element_model_values(name="node_index@en1", device=device, region=region))
  #en2 = map(lambda x : int(x), get_element_model_values(name="node_index@en2", device=device, region=region))
  #en3 = map(lambda x : int(x), get_element_model_values(name="node_index@en3", device=device, region=region))
  #for i in range(len(en0)):
  #  print "%d %d %d %d" % (en0[i], en1[i], en2[i], en3[i])
  
  